滑动折叠菜单:JS实现滑动展开与折叠效果

以下是引用片段：
<script type="text/javascript">
//Url: http://bbs.51js.com/thread-61646-1-1.html
//Author: 风云突变
//Modify: 枫岩
var act;
function over(s,nMax){
var obj=document.getElementById(s);
var h = parseInt(obj.offsetHeight);
if (h < nMax){
obj.style.height = (h + 2)+"px";
clearTimeout(act);
act = setTimeout("over('"+s+"',"+nMax+")", 10);
}
}
function out(s,nMin){
var obj=document.getElementById(s);
var h = parseInt(obj.offsetHeight);
if (h > nMin){
obj.style.height = (h - 2)+"px";
clearTimeout(act);
act = setTimeout("out('"+s+"',"+nMin+")", 10);
}
}
</script>
<div id="mytd" _disibledevent="move('mytd','out');">
<tr><td>无忧脚本 - 风云突变</td></tr></table>